Investigation of phonon behavior in Pr2NiMnO6 by micro-Raman spectroscopy

K. D. Truong; M. P. Singh; S. Jandl; P. Fournier

doi:10.1088/0953-8984/23/5/052202

Investigation of phonon behavior in Pr2NiMnO6 by micro-Raman spectroscopy

Materials Science 2011-01-17 v1 Strongly Correlated Electrons

Authors: K. D. Truong , M. P. Singh , S. Jandl , P. Fournier

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Abstract

The temperature dependence of phonon excitations and the presence of spin phonon coupling in polycrystalline Pr2NiMnO6 samples were studied using micro-Raman spectroscopy and magnetometry. Magnetic properties show a single ferromagnetic-to-paramagnetic transition at 228 K and a saturation magnetization close to 4.95 \muB/f.u.. Three distinct Raman modes at 657, 642, and 511 cm-1 are observed. The phonon excitations show a clear hardening due to anharmonicity from 300 K down to 10 K. Further, temperature dependence of the 657 cm-1 mode shows only a small softening. This reflects the presence of a relatively weak spin-phonon coupling in Pr2NiMnO6 contrary to other double perovskites previously studied.

Keywords

phonon behavior Pr2NiMnO6 micro-Raman spectroscopy spin-phonon coupling double perovskites magnetic properties anharmonicity

Cite

@article{arxiv.1101.2805,
  title  = {Investigation of phonon behavior in Pr2NiMnO6 by micro-Raman spectroscopy},
  author = {K. D. Truong and M. P. Singh and S. Jandl and P. Fournier},
  journal= {arXiv preprint arXiv:1101.2805},
  year   = {2011}
}

Comments

10 pages, 4 figs

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